It looks like this is the relevant option present in the upstream stable
6.8.1 defconfig but not in the 6.8.0-31-generic config that enables the
defconfig kernel to load the Nvidia driver:

CONFIG_SHADOW_CALL_STACK=n

I suspect that the kernel team is not going to want to disable kernel
support for the GCC shadow stack to fix this bug, so my guess is that
we'll need to explore other potential fixes for this issue.

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https://bugs.launchpad.net/bugs/2062380

Title:
  Using a 6.8 kernel 'modprobe nvidia' hangs on Quanta Grace Hopper

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